Santiago tried to evaluate an expression step by step. ( 4 ⋅ 1 0 9 ) ⋅ 0.00003 = ( 4 ⋅ 1 0 9 ) ⋅ ( 3 ⋅ 1 0 − 5 ) Step 1 = ( 4 ⋅ 3 ) ⋅ ( 1 0 9 ⋅ 1 0 − 5 ) Step 2 = 12 ⋅ 1 0 14 Step 3 = = = (4⋅10 9 )⋅0.00003 (4⋅10 9 )⋅(3⋅10 −5 ) (4⋅3)⋅(10 9 ⋅10 −5 ) 12⋅10 14 Step 1 Step 2 Step 3 Find Santiago's mistake. Choose 1 Choose 1 (Choice A) A Step 1 Step 1start color #28ae7b, start text, S, t, e, p, space, end text, 1, end color #28ae7b (Choice B) B Step 2 Step 2start color #6495ed, start text, S, t, e, p, space, end text, 2, end color #6495ed (Choice C) C Step 3 Step 3start color #9d38bd, start text, S, t, e, p, space, end text, 3, end color #9d38bd (Choice D) D Santiago did not make a mistake.

Step-by-step explanation:

the correct option is 2.

step-by-step explanation:

according to the given information triangle abc is a right angle triangle with right angle at a. segment ab is 5 and segment ac is 7. point d is on segment bc and angles adb and adc are right angles.

it is given that triangles abd, cad, and cba are similar.

two triangles are similar if their corresponding sides are proportional.

in triangle cba, using pythagoras theorem

                      )

triangle abd and cba are similar,

                            (2)

triangle cad and cba are similar,

                      )

using (1), (2) and (3), we get

hence proved.

therefore option 2 is correct.